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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fba2445bed81ae20cd584971d6adde72e49ff5fd89cd80e8e818cc2142251d4' 
  AND token = 'eSQ4Zpz88VT2wOcv0QuBJCiImymkmmvZdc0YTG5b550=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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