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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03ca70dc13b16aae2880f14082c2d424fcff28b90d88f690a25d30efc7ad4584' 
  AND token = '5+dp/Yg6xngKngz5NE2FGCfkmawVQEy0emWH7gUasHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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