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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e4143a3793d4c46fc68da1964e9273732960f517b8d4ec8d690cd466c1f4207' 
  AND token = 'XZTAeTKHX9D76nSa32LvndhiS+nnK38vGN5ikwzsh9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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