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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0309e87b4eb84873b065af3f21feeb0045698a850aae07c1936b2ede078a919c' 
  AND token = 'DCRwru5igKDrmXIZ7riSxrgy8+UddbE2MXLF0ncFrnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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