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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77ee9c5c2a45c4aa81d6c80ee984feeb94d6ab570a352495c2488e42abb9d9a3' 
  AND token = 'nrICM0MaS7unohyOqK3AJqCBnfZlrZkGkCN8eDb/e8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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