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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85dcd84085c6a18acd7e7ad44abda17ffc6662e55426cf247bd3923610157d1a' 
  AND token = '5VJCvar0W7bLfaLTD9ZVuZMR60tmX7tcH24GraRr/m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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