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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b595a21aa2e1982708c29def437b1f904e7b0878bb6e502f366efae8a2469ffc' 
  AND token = 'FEu2esoTNcwXbYcGebfhUI/W6dBkEZie/PHamv/vsR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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