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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ddae088c3adbb86ced1807344f94a13d4947f7b562a03f21351b861476c30aa' 
  AND token = 'mR0RmzPmR8MIXUFMAWgTQUdi3FGBmAt+E4KQ33z8qg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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