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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea75a25f9eed6d788ffbd839282854cb826cb374740f2f53608e7feea5c823f0' 
  AND token = '3xaBW7Dxd4Q7bx3+xoBbKCbLZi0MO8u0hi6ERueScdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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