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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2eb620b48726998a1db013a97db940e2060254db26f9134f765a391b7b6e5086' 
  AND token = 'rcMopuPtENi8I5fXrQoZfzc/06b/ecol2bBvy5GuITQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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