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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a8394cccd29dc8ff4329ce4492b93e030e6e4a2cf41d7b9f4d936b250929fb0' 
  AND token = '60w+sPXvloeUakqSY7C8SQ1TdIZLYGpgzSR4ROYYTuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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