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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e37e604fbd6e0e371365ebc569c2bc9d567b64b695159fc0fd0d1b3444b627c6' 
  AND token = 'cg2JAq23sSl4+V2DCfXWD/TJ4AsUVrh9TYkHzOQmSTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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