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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec8f00ea7f0705b23a261b4d44867c8295265c8a70bb2bc32d623ab228a0fa94' 
  AND token = '/3l+uSxuBurYlrHBW/a28UIS8F+zbV4aMdn9xfKhL8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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