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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ac3ed88631a063782abf2eb4194864edd50b2d67ad1f0e369219078c873dabc' 
  AND token = 'N94e0p+hC9imo1+wsJ/XdGjMnk1C5FlbzXyOwdC1RT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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