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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7ed5f6e2885b291dcc45575ff2e045e49c161e7861d95dc8824a11a178bc934' 
  AND token = 'KPW4iwqntlVkpMx2+16SGEzKSrqFVyPPK0KxVhddTiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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