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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '435cb22ab9a42ab080c238f99bbd7e745ff905b54d98eeaf194ce7a8c157ca2f' 
  AND token = '1EaNCVF5OQpV6FJV3PL1FYWmcuh/RiVM3CAbLe6xavQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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