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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b77ccbbe23d448d2b4f738c241b74f85a717016f1d133bbd17abc350cd8e2d99' 
  AND token = 'L+tfTNaIuTnOfpiIMnBH76BXa0JvZ97AkfpAf0CMvT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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