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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5b865ce782dc9eda3b831c1f3977af75a76adc7fdc0c1b9500022ab9c3e3a71' 
  AND token = 'prtYTvk7kOQwHrpYfrsd+xmZLV+VQX3ytAfHXV08uQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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