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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ebaf585201504ae3e3ee88d1960cc9b1a3c40a3111d98587c4dc3391c3514de' 
  AND token = 'rXt713nPwShSW/1uCdrUVRhsClD9FOZN0wU+eB1WOWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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