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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'baeb9a8b1f4dcf8155f346cca78bdc8006b6e30c0336a6d57521bff443f5fb2e' 
  AND token = 'nZjacF7Y7EikNNAehn4sIDncnj3eo4q3h8T7CmrwsRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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