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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e59ed5143d896e854f3ee4fbd9f56349b553f43e123fe49a89b836e970486747' 
  AND token = 'DVNQ4onml+OqtM08Ay/eGHd02tcuPLCmjINQM2QylKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}