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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ceda41743090555dc3af53b329115b7fe31a21fd2c583b5c0ff15f3d704c5bc' 
  AND token = 'fEQCWK7YMXAEifaPm9/IM86Has7JzsKJ0SlWibKcH/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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