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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4084d767bc7752758cca99451a2e661c5f256901a1aa5ebe152ce290bae57d48' 
  AND token = 'W7aZci44ViLObXnBAeOtlNEaWDe1Bc03BqSVFzMnd9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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