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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42608cbe4e3cbebc0597540ee16e81f687c80fcd051c75b618fadc8c0f98d246' 
  AND token = 'toHGfO1Hh44QqSEdpjbzrAmsKg2tXCzvpNmL2N2LPCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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