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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '302f85a40f2d921ac1e1a49f941db71a7242886cfee43186d716e60fd78373dd' 
  AND token = 'aeuHkLr5XZtdhWs85j781zd4RDyIFvFHLqBoodn5VbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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