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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afddadcd623dad704bdd64b06e89a6189fc9f45033fecc03f6733c16b42799c3' 
  AND token = 'JCr/y/kdq5QUszNPcaTaZ1e5g08AJC5oZ7ORctMowWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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