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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0451901259a29cbda77a8eae9162d42cef0e021ef530bf8ad5e3af1f30c71b57' 
  AND token = '7M9T5WPgHir6nL2WWyBwK931lX+Ygxs/Z6OS6SigcWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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