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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c975701b18262bb87c7f39719c286915ed0f4e26b91354355603e777445ea3ee' 
  AND token = 'yE5XW8OFG99dQnkpXkH85/9zVGbD29ImuZ/eGsKrtEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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