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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa3ed3bcff2f18dfd8a036cb91599623a1c9f897201655901a03c0d0fadc7005' 
  AND token = 'QNybUP6FRASiA7WDKPfgx5kzl5c9x8uj1JI1RWIENSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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