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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ba4700c8789e27f7929e97d0e9c594c9d167fa63762cf92ac5bae5d2c4dcf86' 
  AND token = 'myX1HXMZh6bJind6I1+wzyszUoodmSi8eMOeuyOQQ0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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