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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8470e54cbc48d5e65ca956eaf9a415310adb688116d3db8cc489eff4c4eee738' 
  AND token = 'mt3RajnNJah6uArmFNT9Pyz+32TUQ0rfLa9PpDn056A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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