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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd58b7f9556fd4818ab65d3f0126b4c4c393f60bafb5f89f9d945c9841688ffb0' 
  AND token = '99R1VyrYMHJPkzacbGCPuPD1WtbxyIIcl7bESWd9hAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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