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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd97a88ef61fef3b6b284745d10b3238725f11751462bb9473f07a1453f0b6148' 
  AND token = 'ji28mQcf9BL6Olz0uxW9S3dSRU95Als7YM3kBZZXPmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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