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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe236724c52e1d60581b31e4968f14e7ba6b753670923312fbd33646230a93d7' 
  AND token = '2UWt76HbbuVMtlh5+eqHj+J4+kebi1Mkv+4Z9Yy9GmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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