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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50a3ab83430257cfb4d1017370e545b3550c613d8d5cc14ef40903c68e5236a1' 
  AND token = 'BCDUmyj+qHaIpUjC/dBO6gqLDXrtaOPOCnfDErG+N6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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