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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5c689ce847cfac965d1cdc3c1def70e2386e9f03d46b0c3a6df72e4c3d32fcd' 
  AND token = 'I13FPbp9xAisE1v3BZ/JTmJ8NatuBQnBLw6/kKDWumg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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