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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50688cb1f274cec3dce51b7ea2b1b91f784772a38657ac80ffb568a784e510cc' 
  AND token = 'lF/rFeDbxX1zxI1ZT+C7Am38slk3M2byQ22OHn14HlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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