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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1602689d363a84653b7ed6a127c92eff1876eb2e87a7270ddc719591c2dfa3b4' 
  AND token = '4PNuaUOU8tQsLsq6w86ZkB6hU/2V2vz5BflAHkt7M2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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