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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29fa2f7b84feee9af10fc5f0b963c41596b08cca507c18b9f1fc0163ec64bc73' 
  AND token = 'q4t57QiRXgT9nE4Vm+Ag8JYSDenx3HYfgAtFZKzXLWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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