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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd6636d706c02735611bf928face35f6c6fb5ee9b7359b5fd270f93fe08c13a0' 
  AND token = 'lRTz4o4jVwSTU08hPgjG815q5j5djpwS3tRaAb1xY1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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