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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28c38ac8935ee5fa87be27eccdaa4c98c75c3e1ca28480abee644b62294bcd82' 
  AND token = 'QAdL5I6VlBaOhKqhjHG9bbtsK4UBjZ1iCIt07fdof3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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