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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1128ec46c371e3477b61eb88151842de911134b6b338339b33419aaed1f6917d' 
  AND token = 'yjbH6L7/hwSi5gGKq6Y0Uv6S4tN8/wil+ZcgN8pXd8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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