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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99ec614da200168358e59d3b9cbd481dc3f8da2d6b8aed3dc13ca028c6bf612c' 
  AND token = 'RYjC24lX9ZDus0o8l7TIq9sk5/WPipjtnLpGTFk6q1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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