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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09bf8a03cc0965f134d4926605a3e42f881c08d6eb0c112925861329e81645f8' 
  AND token = '4BCOuHEPu8w4U4vw3uRtgrZ4pqWA1OPvFgn2dxFF5dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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