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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9169222e1eb078cbde5db0766879e0c19f36befdc637e1e9013a6773e65f6df' 
  AND token = 'iZoVmKUBuNIxccPvS7kZYg2tkHWntMv6Dge3A97DEJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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