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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f89b1759f13018e78e55499661287a05ff3028d9b11467036f736c26dec66a8a' 
  AND token = 'z5pKLXlNW/uJ1/QN8PXb7THgMN4TPxPsd9LxJ95SzDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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