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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9833a4e1744ac19cb96275e402c1af062365d3681382cb79c3de25b8d575c5d' 
  AND token = 'zLAOFk1xpa08naJcbTo8q9VsPkCwDE8jf6xmLNrDqnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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