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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8edd2337224e9ae2a85a5fd8b573ff14e547234bef8b9a12cd1742b445ec379b' 
  AND token = 'zgL8jAr9M4fOXgOfzynYrplvEii1/MuqDw81hEzERZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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