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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93189d5e96ffbbec02df2a8e15d8c11e5a51514bb8e806beb36d2fcf6102c87a' 
  AND token = '0+PtjhgZfjEdBZt+evn/7pbzH7rheX12ZoMUZSEjyqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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