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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7cc16a256c61c4a2b82f1aad6c6fb78c2c9cd8921c1cb58f6885eab7f8820997' 
  AND token = 'xzGC+RDlzyovp3MpzIO9WV7TfGGhsD2Zdt5s7SVyJ3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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