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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3053adb5a22643ecc591fda922386c30ee62e642b4aee4a91f6d040fcfb6ddd' 
  AND token = 'SHBcecMoq0TYVmjMLDUsUJLosvxiJhFOlI1d70k0Fgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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