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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddca0c9b17c2148740c808593899c7a395d3ab72d903fbf2965c34fdaa621535' 
  AND token = '0U0tawfDEf9cPjB72IxRLCwL4UE/OMtYkXrdqcDbEmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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