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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fd48e0d47d13771ef78f5c5467199b039e220bf847c41814d0115488b541bb7' 
  AND token = 'q7149XoyQdAqfHyYj8P7q1wQpuYg+CBQmoKyD0g6qgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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