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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ecb3ed5bf585123e0ab8c4584707d320396bbb7e265e6c180a801fb824a0fad' 
  AND token = '7UeAfuejVMnoBZ5IaEen1pGUnx7GhZL6+8Q6bpN6tLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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